**5. Conclusions**

This chapter focuses on the application of CFD technology in GSHP system. Firstly, for the simulation research field of GHE heat transfer characteristics and heat transfer process, the research progress of scholars from various countries is reviewed. Then, in order to further elaborate and introduce the application of CFD technology in GSHP system, the HGHE is taken as an example. Considering the dynamic environment conditions and the initial soil temperature conditions, the ANSYS\_FLUENT software commonly used in CFD technology was used to simulate and study the heat transfer characteristics of HGHE under different inlet water temperature conditions, and the accuracy of the numerical model was verified by experimental means. The following conclusions are reached through the research:


temperature. However, when the inlet water temperature of HGHE is high, continuing to increase the inlet water temperature will seriously aggravate the soil thermal interference near the spiral pipe, which will greatly hinder the heat transfer process of HGHE. At the same time, too high inlet water temperature will increase the outlet water temperature, indirectly causing higher condensation temperature, resulting in lower efficiency of the GSHP system. Therefore, the thermal interference effect and the condensing temperature of GSHP system should be comprehensively considered in the actual project, and the appropriate inlet water temperature of HGHE should be selected.
